Air-pump.



W. A'. COOK.

` AIR PUMP. `.lPPLloxrIoN Hmm ma. 25, 1910. 977,274.- Patented N0v.29,191o.

. 2 SHEETS-sum1.

-- www a possesses great several objects are attained axial alinement.

J Citizen of the United sans,

WILLIAM A. COOK, OF NEW YORK, N. Y.

AIR-PUMP.

To all whom it may concern:

Be it known that I, W ILLIAM A. Coon, a residing in the city, county, and State of New York, have invented certain new. and. useful Improvements in Air-Pumps, of which the following is a specification. A

This invention is directed to the provision of an improved form ofair pump adapted particularly for use on automobiles for inliating the tires thereof.

The object of the invention is to provide an improved form of air pump which is portable and can be h etached from a suitable support, as for 1nstance, the step of an automobile, which strength so that it is well able to withstand rough usage in connection with automobiles, which is simple in con struction and can therefore be manufactured at low cost, which is efficient and reliable in operation and in which the air passages are so formed that joints therein which mi ht become loose and leak, arc eliminated and that ample protection is provided to guard, them against severe blows. These in a pumy the frame of 'which is a single casting consisting. of a vertically disposed wall and cylinders integral therewith andv on opposite sides thereof, these cylinders being disposed in Any suitable number of pairs of cylinders may beernployed though preferably four such cylinders are used, these beingarranged two at either side of the vertical wall, andA one on each side in axial'alinement with one on the opposite side. Pistons reciprocate in these cylinders actuated by a handle journaled centrally with respect t'o the cylinders in the centralvertical plate, Aand suitable valves admit air to the cylinders for compression and permit theescape of the air when properly compressed. The passages for conveying comressed air from the cylinders to the means lbr carrying the air to the devices in which it is to be used .are formed directly in the casting constituting the frame of the pump so that there are no joints in these passages which might become loose and leak, and the passages are thoroughly protected against severe blows such as a portable, detachable pump to be carried by an automobile would undoubtedly receive. The valves are arranged in these passages for precluding the return of the compressed air to the cylin- Speeieation of Letters Patent. application filed March 25. 1910.l

readilyattached to and Patented Nov. 29, 1910.

Serial No. 551,427.

ders and these valves, as well controlling the inlet of air to are so constructed that the use bricating oil in the atl'ect the complete valves are tons and are automatically opehed by suction during the return stroke of the piston. I have illustrated the preferred embodiin'ient of my invention in the accompanying drawings in which i the cylinders, of ample lucylinders will not so parts thereof as to result' in inclosing thereof. The air-inlet as the valvesv mounted one upon each of the pis- Figure l is a central vertical section of a pump'embodying' my invention, Figx is a side view of the same broken away and sectioncd in part, Figa 3 is an end View of a portion of the pump having removed therefrom, Fig. 4 is a detail View in horizontal section showing the air passages and Fig. 5 is a sectional detail View through one end. of one of the pistons.

Referring to these drawings, the frame of the pump consists of a central vert-ical wall l and 'cylinders 2 and 3 formed integral with the central wall l, these cylinders being arranged in pairs, one on either side of the wall l, and the cylinders of each pair in axial alinclnent. ln the present instance I have shown a four cylinder pump, and thisI is the form which being two cylinders on each side of plate l, each in axial alinement with one on the other side. The frame.: of theepump, therefore, consists of asinglc. casting having all the cylinders formed directly therein, Yand moreover, the air passages leading from these cylinders are formed directly in this casting. Also, the casting supports the operating mechanism for the pump and is shaped to provide means for detachably securing the pump to a support. Near the central plate l, legs 4 are formed therein, having horizontally disposed bottom surfaces. At one side of these legs the plate l is extended downwardly to form an arm 5 in which is a threaded opening to receive a screw-clamp 6 which may be screwed up in this opening in arm 5 to grip a suitable support, as for instance the step of an automobile, between its upper end and the legs 4. At the center' of the central wall l, that wall is formed to provide a bearingr for an operating shaft 7 to the outer end of which a detachablel handle 8 may be applied. To the-inner end of this shaftis secured a pinion 37 meshing with two gears 9 each the end ,i plate n l prefer to employ, there i loe li" r carried by a short shaft mounted for io-v tation in a bearing formed in the central plate 1, one of these shafts 10 being directly above and the other directly below the shalt 7. Secured to each shaft 10 orto the gear 9 thereon is a disk 11 carrying an eccentrically disposed crank-pin 12. Each crankpin 12 has two connecting rods 13 and 14 pivotally connected thereto, these connect-ing rods extending in opposite directions from the crank-pin and having their distant ends .connected to pistons .15 reciprocating in axially alined cylinders 2 and 3.

The outer ends of the cylinders 2 and 3 at the outer ends of the pump are closed by a plate 16 secured in position by a plurality of screws 17, a gasket 18 being preferably provided between each plate 16 and the ends of the cylinders. Plate 16 and the gasket 18 have shallow grooves 19 formed therein, as best shown in Fig. 3, each adapted to connect a cylinder with an air passage adapted to carry compressed air from that cylinder.

These air assaaes are formed within the casting constituting the frame of the pump, preferably in the spaces between the two cylinders at each end of the pump. Figt of the drawings shows a central horizontal section through the center of one end of the pump and it will be seen that two passages i 20 and 21 arelprovided within the casting,

these passages being joined at 22. In each passage 2O and 21 is a valve 23 controlling communication between the passage 20 and 21 and the corresponding passage provided by a groove 19 and leading to a cylinder.

The construction shown in Fig. 4t is duplicated at the other side of the pump and the two passages 22 at opposite sides of the central wall 1 are connected by a tubular passageway 23 formed by an integral part of the casting constituting the frame of. the

pump, this tubular passageway 23 in addition to conveying air forming a brace for the frame at the side of the pump opposite that at which the wall 1 lies. It will be seen that lthe cylinders 2 and 3 are all disposed upon one side of the plane of the central plate 1 the tubular member 23 extends from the cylinders 2 and 3 at one edge of plate 1 to the cylinders wat the other-edge atthe side of those cylinders opposite plate 1; it therefore strengthens the construction very ma- 'the valve consists of a plug 26v threaded so that it may be screwed into .position by screwing it into a threaded opening, and

this plug has an opening therethrough to receive a tubular member 2 7 adapted to lmove back and forth in this opening. A

spring 2S bears at one end against a shoulder formed in the opening in plug 26 and at the other end against a shoulder formed upon the tubular member 27 to normally hold member 27 in the position in which it is shown. To the end of tubular member 27 is secured a bonnet 29 having an overhanging circumferential lip -30 which, when the member 27 is in the position shown,

closely incloses the end of the plug 26. Be-

tween the lip 30 and the body of the tubular member 27 is a washer 31 of rubber or similar suitable material, and immediately below this washer, radial openings 32 are formed in the wall of the tubular member 27. lt will be seen that the inlet valve shown in Fig. 5 will be opened in response to the suction within the cylinder against the tension of spring 28, this suction moving tubular member 27 until openings 32 are carried beyond the end of plug 26. Spring 28 will then move member 27 to the position shown in which the washer 31 carried by member 27 engages theend of plug 26, so as to effectually guard against the escape of air from the cylinder through the inlet valve. Furthermore, the lip 31 closely incloses the end of plug 26 and thus prevents contact of the oil, which must be usedin the cylinder, with the rubber washer 31, which oil Will cause the rubber to deteriorate so that it would soon be rendered useless. In the case of the inlet valve shown in Fig. 5, 'a nut 33 may be screwed upon the threaded end of plug 2G and may be employed for holding in position a gasket 3e by means of a metallic washer 35.

l have found in practice that a purnp thus constructed is reliable and'etticient in operation and is of a construction possessing great strength and at the same time its simplicity permits of manufacture at low cost. The pump is well adapted for use in connection with automobiles, since it occupies but little space, can readily be attached to the step for use and detached for storage in the tool box and is of such a rugged construction that lthere is little danger of its `getting out of order, this latter characteristie resulting particularly from the formation of the air passages directly in the casting of the frame of the pump. The strength, ruggedness, simplicity and reliability of the. pump are largely due to the employment of the frame construction herein shown, consisting of the central plate carrying the operating mechanism and formed to facilitate attachment of the pump to a support I I land cylinders formed integral with this cenvtral plate in aXially-alined pairs with the air passages leading Itherefrom also formed in the casting, each at the side of itsvrespective cylinder. I

Having now described my invention, what I claim as new and desire to secure by Letters Patent is as follows zl. A pump huving frame formed of a single casting and consisting of a central wall and four cylinders integral therewith and located two ateither' side of said wall andin axial alinelnent with the two on the other side, attaching means formed o'n said central wall for removably securing the pump to a support, passages for air -formed directly in said casting and cach leading from a cylinder, the several passages being joined together within said casting, a shaft journaled in said central wall, a pmion carried thereby, two gears meshing withsaid'4 pinion and mounted for rotation on said central wall, a crank-secured to each gear,

pistons in said cyli'nders,vthe axially alined pistons being connected to the same crank, andi-a connection to the single air passage in the casting leading' to al said cylinders for'iearrying air therefrom, substantially as setforth'.

2. A 'f..pump'having a;frame formed of a singecasting and consisting of a central said wall, a pinion carried ly wall and 'four cylinders integral therewith and located on one side of the plane of said wall and two at either of the lateral edges of said wall, the cylinders at one of the lateral edges being in axial alinement with thoserat the other edge, attaching means formed on said central wall for removably securing the pump for air formed in said casting and each. leading from a cylinder, the passa es for the cylinders at one edge of said wal being joined to those at the other edge by a single tubular member formed integral with said. casting and lyin at the side of said cylin-f ders opposite said wall, a shaft journaled in said shaft, two gears meshing with. sai l mounted for rotation on said wall, a crank secured to each gear, pistons in said cylinders, connecting rods connecting each crank to two pistons in axial alinement, and a connection to said tubular member for carrying air therefrom, substantially as set forth.

This specification signed and witnessed this 23rd day of March, 1910.

WM. A. COOK.

" Witnesses:

W. C. McCURoY, HARRY A. LEVINE.

to a support, passages pinion and 

